<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="app">
    <ul>
      <li v-for="item in arr">
        {{ item }}
      </li>
    </ul>
    <hr>
    循环数组 并得到下标
    <ul>
      <li v-for="(item, index) in arr">
        {{ item }}
       ->
        {{ index }}
      </li>
    </ul>
    循环对象
    <hr>
    <ul>
      <li v-for="value in json">
        {{ value }}
      </li>
    </ul>
    <hr>
    循环对象并得到key
    <ul>
      <li v-for="(value, key) in json">
      
        {{ key }}
        ->
        {{ value }}
        
      </li>
    </ul>
    <hr>
    循环对象 得到key 并得到下标
    <ul>
      <li v-for="(value, key, index) in json">
      
        {{ key }}
        ->
        {{ index }}
        ->
        {{ value }}
        
      </li>
    </ul>
  </div>
  <script src="./vue.js"></script>
  <script>
    const vm = new Vue({
      el: '#app',
      data: {
        arr: ['a', 'b', 'c', 'd'],
        json: {
          name: '小明',
          age: 18,
          gender: '男'
        }
      }
    })
  </script>
</body>
</html>